What you are missing with the current AAA gun implementation is that, probably mostly for framerate reasons, each field has a tiny fraction of the guns protecting it that real WW2 era airfields (particularly late war German) had.
Given the choice between hundreds of ("realistically" aimed) guns with framerate that you measure with a calender, or a few accurate guns with a high framerate, I'll take the latter option, thank you very much.
That said, I do think there is merit to having the existing guns fire in bursts, and to give them the ability to be "surprised" by a sudden attack. Long term, I'd also like to see different types of AAA, but I understand that is already in the works for the future.
-Smut
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XO, The squealing Pigs
"Oink! Oink! To War!"